GreatBasin: History of water supply in one of the driest regions in the US NaturePortfolio
Relation between Devils Hole water-table change and recharge
The nonlinear relation of Devils Hole water-table change to AMGB recharge is about three-to-four times as sensitive to recharge changes during drier, interglacial periods , compared to wet, glacial periods . This nonlinearity occurs because Devils Hole is within the Ash Meadows discharge area, which is the primary discharge area in AMGB .
Paleo recharge was estimated using scaled- and uniform-recharge approaches to account for uncertainties associated with spatially distributed recharge, compared to modern conditions. Both recharge conceptualizations assume that the recharge distribution is controlled by high and low topographic altitudes, despite atmospheres that are either cooler and wetter or warmer and drier.
Paleorecharge to the AMGB was estimated for the Devils Hole paleo-water-table record that spans the last 350,000 years. The lower limit of the paleo water table was most likely above −1.6 m r.m.w.t. during peak interglacial conditions, which relates to a decrease in estimated recharge of no more than 17%, relative to modern, using the scaled-recharge assumption. A water table lower than −1.6 m r.m.w.t. cannot be ruled out but is considered unlikely. The paleo water table was at least +9.5 m r.m.
Relations were derived between Devils Hole water-table change and AMGB recharge. The relations are expressed as cm of Devils Hole water-table change per percent change in AMGB recharge . Similar relations between Devils Hole water-table change and AMGB recharge during glacial conditions indicate the relative insensitivity of how recharge is spatially distributed during wetter climates. A relation of 9.
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